(London, England: Stephen Frazier) Operations in nuclear plant in Sellafield, England, that suffered damages from fire in 1957 featured; details given, historical film shown of area's response to radiation released by fire. Suppression of report on incident by Macmillan recalled. [Nuclear analyst Walter PATTERSON - says public morale could have been affected if report released.] Defense of cover-up reported [British Atomic Energy Authority spokesperson Dr. John GITTUS - says public confidence in nuclear energy should not have been risked.] Contents of documents detailed. [Representative Gerry SIKORSKI - says report could have led to safeguards.] Issue of development of nuclear plants in Britain and possibility of other cover-ups noted.